<?php
/**
 * Copyright 2012 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/**
 * @author Chirag Shah <chirags@google.com>
 *
 */
class apiMediaFileUpload {

    public $mimeType;
    public $fileName;
    public $chunkSize;

    public static function process($metadata, $method, &$params) {
        $payload = array();

        $data       = isset($params['data']) ? $params['data']['value'] : false;
        $mimeType   = isset($params['mimeType']) ? $params['mimeType']['value'] : false;
        $file       = isset($params['file']) ? $params['file']['value'] : false;
        $uploadPath = $method['mediaUpload']['protocols']['simple']['path'];

        unset($params['data']);
        unset($params['mimeType']);
        unset($params['file']);

        if ($file) {
            if (substr($file, 0, 1) != '@') {
                $file = '@' . $file;
            }
            $payload['file']         = $file;
            $payload['content-type'] = 'multipart/form-data';
            $payload['restBasePath'] = $uploadPath;

            // This is a standard file upload with curl.
            return $payload;
        }

        $parsedMeta = is_string($metadata) ? json_decode($metadata, true) : $metadata;
        if ($metadata && false == $data) {
            // Process as a normal API request.
            return false;
        }

        // Process as a media upload request.
        $params['uploadType'] = array(
            'type'     => 'string',
            'location' => 'query',
            'value'    => 'media',
        );

        // Determine which type.
        $payload['restBasePath'] = $uploadPath;
        if (false == $metadata || false == $parsedMeta) {
            // This is a simple media upload.
            $payload['content-type'] = $mimeType;
            $payload['data']         = $data;
        } else {
            // This is a multipart/related upload.
            $boundary                = isset($params['boundary']) ? $params['boundary'] : mt_rand();
            $boundary                = str_replace('"', '', $boundary);
            $payload['content-type'] = 'multipart/related; boundary=' . $boundary;

            $related         = "--$boundary\r\n";
            $related         .= "Content-Type: application/json; charset=UTF-8\r\n";
            $related         .= "\r\n" . $metadata . "\r\n";
            $related         .= "--$boundary\r\n";
            $related         .= "Content-Type: $mimeType\r\n";
            $related         .= "Content-Transfer-Encoding: base64\r\n";
            $related         .= "\r\n" . base64_encode($data) . "\r\n";
            $related         .= "--$boundary--";
            $payload['data'] = $related;
        }

        return $payload;
    }
}